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Why is it that one of the telemetry radios has a solid red led all the time and it is not working?

This might be caused by a corrupted firmware on the telemetry radio. Re-install the firmware, as described in the next procedure:

 

Using mission planner:

  1. Connect the telemetry radio to the computer, select the serial port and 57600 bauds, don’t hit connect yet.
  2. Go to Initial setup >optional hardware >3DR Radio.
  3. Click upload firmware (local).

    Image

    APM planner doesn’t have an upload firmware option, but MAC users can try the next procedure in a terminal:

     

    1. wget http://firmware.diydrones.com/SiK/stable/radio~hm_trp.ihx
    2. wget http://smaccmpilot.org/artifacts/sik_uploader.py
    3. sudo easy_install pexpect
    4. python sik_uploader.py –port ENTER_SERIAL_PORT_HERE(i.e. /dev/cu.usbserial-DN0019TF) –baudrate 57600 radio~hm_trp.ihx

    If the firmware upload doesn’t correct the problem then the telemetry radio is damaged or defective.

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